Forget everything you think you know about what happens in the story of Evangelion, because Rebuild 3.0 - You Can (not) Redo takes things in a radically different direction.
Evangelion is probably one of the most influential anime series of the last two decades. Originally aired in 1995 under the name "Neon Genesis Evangelion," the story focuses on a post-apocalyptic Japan. 15 years ago an event called the "Second Impact" happened, melting polar ice caps and summoning giant monsters called Angels. The monsters proceed to do what giant monsters do best, and ruin things.
The protagonist of the story is one Shinji Ikari, a 14-year-old who is called to Tokyo by his mysterious father. Turns out Dad is the leader of a military taskforce, called NERVE, and is dedicated to eliminating the Angels. NERVE's weapon of choice are giant robots called Eva, and Shinji has been volunteered as the newest pilot.
Now this summary probably doesn't do the series the justice it deserves, but Neon Genesis was probably the series that first introduced me to the medium and it stands out as a shining beacon among so much rubbish.
You Can (not) Redo is the third instalment in the Rebuild of Evangelion series, a collection of four movies ostensibly recreating the 24-episode TV series.
I use the word "ostensibly" because until this film the series had only a few minor inconsistencies - barring the end of the second movie.
This film takes place 14 years after the end of the You Can (not) Advance, opening with Eva pilots Asuka Shinikami and Mari Makinami battling what appear to be Angels in space.